Typewriting machine



22:19.25. 566,372 G. W. CAMPBELL TYPEWRITING MACHINE Filed Oct. 27, 1921 4 Sheets-Sheet 1 Dec. 22, 1925- G. w. CAMPBELL TYPEWRITING MACHINE Filed Oct. 2 1921 4 Sheets-Sheet 2 /nvemor Afforny Dec. 22, 1925.

G. w. CAMPBELL TYPEWRITING momma Filed Oct. 27, 1921 4 Sheets-Sheet 4 Patented Dec. 22, 1925.

UNIT-E59 STATES PATENT OFFICE.

GEORGE W. CAMPBELL, OF HARTFORD, CONNEGTI FIT, ASSIGNOR TO UNDERWOOD TYPEWRITER COMPANY, OF NEW YQRK, N. AzCIQRPORATEON OF DELAWARE.

TYPEWVRITING MACHINE.

Application filed October 27, 1921. Serial No. 510,726.

To alt whom it may concern:

Be it known that I, Gnonon "W. CAMrBnLL, a citizen of the United States, residing in Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Typewriting Machines, of which the following is a specification.

The present invention relates to sounddeadening casings for typewriting machines; that is to say, to casings in which the machine may be placed and operated with a minimum of noise. In casings of this character,provision is necessarii y made for the protrusion of the keyboard section of the'machine through the front wall of the casing in order that the keys may be accessible to the operator; and pr vision is also made for the protrusion through the casing and for the travel therealong of the operating arms, which are mounted on the carriage and move therewith on the machine, such as the line-space lever, the carriage-release-lever, and the carriage-return-arm. To permit of placement of the keyboard extension, while nevertheless providing a sound-proof front wall for the casing, the front wall has a hole therein, through which the keyboard extension is swung while the machine is being inserted through the top of the casing, the front of the machine itself being utilized to close that part of the hole which is above the keyboard when the machine is finally in place. The present invention more partic ularly relates to the latter type of easing, although it will be found that in many of its features it is not so restricted.

Casings of the character mentioned have their walls lined with sound-deadening members, variously shaped and secured; and preferably have a window through which the printing may be observed, so that a "visible typewriter remains such, when used in the casing. The casing may also have its own sound-deadening floor. The present invention relate in part to these features of constructien. In what is perhaps its more important aspect, however, the invention has reference to-the construction of the casing shell and frame.

The invention aims to make rigid the o dy, having no top or bottoin,-and to inthat the large hinged cover shall fit e to confine the no the sealed slot.

secure such accuracy of construction as to permit rapid and'easy operation of the carriage with its handles protruding through The invention also aims to support the heavy typewriting machine properly upon the thin and weak sheetmetal walls, without tearing away from the walls, or bending or distorting the same.

In carrying out the invention, the back, sides and front are made of a single rigid unjointed die-castpiece of metal, each element reinforcingv the other three. This body will not become skewed when subjected to ordinary rough usage, and hence the cover will always fit, andv sound will not therefore escape. The large cover, with its heavy glass pane, is sustained upon the side portions of the body, as the entire front of theco-ver mustbeout of contact with the body, this being the position of the slot which is sealed by the soft tubes, and through which the carriage handles travel. The die casting extends at its top portion entirely across the front of themachine, counteracting the tendency of the heavy cover to spread apart the sides of the body. An unbroken, unjointed, stiff, upper boxlike portion is combined with a lower unbroken, unjointed, stiff box-like portion, these two portions being joined to each other by a plate-like body-portion -which is integral with both said top and bottom portions, the body comprising four integral corners conducing to rigidity.

A feature of the invention is the provision of die-castings, one to form and comprise the body-portion of the casing, and an other to form and comprise the cover therefor. The number of parts, the joints to be closed, and the time and labor involved in assembling are thus all brought to a minimum. Moreover, since the castings are jointl'ess, and are of great rigidity, although thin and light, the casing will be durable as to its sound-deadening qualities despite strains and shocks incident to rough handling. Not only need the castings have no joints to be opened by strains, but their rigidity prevents loosening or displacement of the lining-members under external strains. V

Another feature of the invention is the provision of re-enforcing ribs-formed in the casting operation, which ribs are preferably disposed along the top and bottom er ges of the casing-body; along the bottom edge of the cover; and along the edges of the openings in the walls of the castings. A further feature of the invention is the adaptability and use of these ribs for other purposes, such, for instance, as anchorages for the lining-member Screws for holding the lining-members; screws for holding a felt-bottom for the casing; and screws for holding cushions for closing the slot along which the operating levers of the machine travel, may, any or all of them, be threaded into the ribs to a depth not obtainable in other parts of the casing, and their grip on the casing thus assured.

Other objects of the invention are the provision, as part of the cover-casting, of a frame for a transparent window-pane therein; the provision, as parts of the cover and body castings, of seats for the cushions which close the slot for the operating levers; the provision, as parts of both castings, of flanged interior offsets to serve as abutments and retaining devices for the lining-members; and the provision, as part of the bodycasting, oflugs or devices for positioning the feet of the machine within the casing. A. feature of the invention is the function which the window-frame, cushion-seats, and other parts just referred to have as l e-enforcing ribs by virtue of being integral parts of the castings; or, conversely, the functions as window-frame, cushionseats, etc, to which the re-enforcing ribs may be adapted.

The various objects and features of the invention are preferably embodied in a casing, the body-casting of which is an elongated, rectangular shell, open at top and bottom, and ribbed around the top and bottom edges; and the cover of which is arched to accommodate the carriage of the machine, and is ribbed at its front edge and along intermediate lines which define a window-frame.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a perspective view of the sound-deadening casing showing it closed.

Figure 2 is a perspective view of the sound-deadening casing showing the cover sprung to its open position.

Figure 3 is a side view vertical section of the casing.

Figure 4c is a top plan view showing part of the carriage and the operating arms and levers thereon.

Figure 5 is a sectional side view of the casing showing the manner in which the machine is inserted into said casing.

Figure 6 is a detail sectional plan view of the right-hand end of the casing showing, among other features, the means by which the machine is positional therein.

Figure 7 is a front view partly sectioned of the right-hand end of the casing.

Figure 8 is a rear perspective view of the detachable plate at the front of the machine.

The Underwood standard typewriting machine comprises a main frame '0, supported by feet 11 upon a base, and is rovided with a forward extension 12, in which are positioned banks of keys 13, for operating typebars 28, to cause types 29 carried thereby to print platen l5, journaled in the end walls 18 of a platen-frame The platenframe forms part of a carriage 20, mounted for letter-feeding movement upon a front rail 51 and a rear rail 21, tired to the main frame 10. The carriage is pro" aed with various forwardly-extending levers or arms, such as a line-space-lever 23, a carriage-return-arm 2%, and a carriage-release-lever 25.

For deadening the sounds occurring in the typing operation, there is provided a sounddeadening casing or hood, comprising a body-part 30, and a cover-part 31, hinged to the body-part at S The body-part comprises a rear :all 35, side walls and a front wall 3?. To permit of operation of the type-keys from outside of the casing, the front wall 37 has a substantially rectangular opening 38, through which passes the forward extension 12 of the machine, so as to expose the banks of keys 13. To provide for letter-feed movement of the carriage within the casing, and to aliow room for the paper which hangs down at the rear of the paper-shelf and travels with the rarriag'e, the body-portion of the casing is somewhat wider at its base than is the machine, and, as shown in Figure 9, flared upwardly and laterally at to the full width of the cover-portion; in which latter, the carriage has its throw between extreme positions. To each side of the opening 38 in the front wall of the body-portion 3%) of the casing, there is therefore presented a waltportion 40 of somewhat trian ilar shape; and, connecting the front wall-portions lO above the opening 38, the front wall. 37 is in the form of a strip 41, which is flared forwardly from the vertical, at 42, and is then turned vertically upward, as atit. Below the opening 38 in the body front wall, the wall also takes the form of a horizontal. strip 44, which is likewise offset forw rdly just below the base of the machine.

The casing is a die-casting; or, rather, is comprised of two die-castings, one of which comprises the body-part 30; and the other the cover-part 31. A bead 45, which forms a part of the casting 30, extends entirely around the same at the base thereof, 1 serves as a rib-re-enforcement. The head being on the outside, serves also oil mentation. For eaeh of the front 1 portions 40, there is provided a liningpiece 47 of'felt orother sound-deadening ma terial. These lining-pieces 47 conform to the shape of the parts 40, and are mitered,

at their upwardly-curved lateral edges 17,

see Figure 6, to lit'with a similar mitering,

on liningpieces d8 for the sides-of the bodythrough the lining-pieces 47 from the inside.

These strips 49 also serve as re-enforceinents for the front wall at the opening For holding the liningqaieces 47 .to the casing front portions 40, at their upper edges, there is provided a strip 52, see Figure 3, which Y extends over the opening 88 entirely cross upper edge 55 of the front 'lower'lininge the front of the casing-body, and between whichand the front of the casing-body the lining-pieces l7 are set. Screws 53 pass through the strip 52 and through the linings 47, finally-to be threaded into the wall of the casing. Also held at its upper edge, in like manner, by other screws 53, between the strip 52 and the front of the casing, over the opening 38, is a felt strip The lower edges of the lining-pieces 47 overlie the reenforced or beaded lower front edge l5 of the casing, and are held to thesame by screws 22 which pass through these liningpieces from the inside and into the beaded casing-rim. The bead allows such depth of screw-hole as will provide a firm hold for the screws.

Below the opening the front of the cas ing is lined by a strip of felt the lower edge of which is attached to the re-enforced or beaded lower edge of the casing by other screws 22; and the upper edge of which normally projects slightly above the upper edge of the front casing-strip lt below the opening 38. To permit operation of the space-bar-supporting levers 87 and the shift-lock-release-lever 94:, and to receive the side frame-piecesl63 of the machine, the front piece 4.4 of the casing below the open- 38 is slotted, as at 87, '94: and 1623, re-

spectively; and the lining-piece 55, therefore, has slots or cuts in registration with the slots 87, 94- and 163 Screws 58 pass through the strip 55, I between the slots therein, and into the front wall of the casing to hold the lining-strip in place. The

strip 55 above the front lower casing-portion i is free and flexible, so that, when the machine in place, this flexible edge 55 is forced d own by the shift-loclt-release-rod 19 lVhen the machine is in pl of the typewriting machine as shown in Fl .ure 3, and prevents rattling of that rod. .21 sound-deadening lining-strip 26 of felt is carried by the machine between the front feet thereof. This strip 26 ,extendsup from the base to a point where it slightly overlaps the comb-plate 60, thus cutting off the emission of sound from below the keyboard.

Inthe present invention, the machine is to be placeable in, and removable from, the casing without necessitating the removal of any part of the front of the casing-body. It is, for this reason, that the front of the casingbody, over the forward extension 12 of the machine, and infront of the type-bar'- basket, is not provided with a depending arcuate portion to conform to the usual. arcuate chamber defined at the front ofv the machine by the type-bar-basket. If such an arcuate casing-piece depending from the front casing-strip ll over the opening 38, it would render somewhat ditlicult'the re moval and insertion of the machine. Nevertheless, if noise is to be shut off, the opening which would otherwisev be formed between the lower edge of the front casing top strip ll and the arcuate opening in the front plate of the machine should be closed.v This closure is here effected by a plate :61, which is ears or fingers which bear against the J upper edge of the machine front plate 63. in the casing, the upper part of the removable plate (-1 on the machine lies against the inside of the felt liningestrip Filover the opening 38 in the casing front plate. The plate 61 is also provided with a hook-like extension 65, which engages behind the front plate 63 to hold the lower part of the detachable plate 01 against th front plate (33; A. strip of felt 67 herein shown attached to the inside of the removable plate 61 by a strap 67*, serves as a sound-proof lining therefor. This felt piece 67 is of substantially the shape of in place in the casing, see Figure 6, an extra thickness of lining is desirable at the side edges of the opening 38. This extra thickness is effected by the placement of two narrow strips of lining-material between the lining-pieces 4:7 and the front casingbody-portions 10.

Cast integrally with the casing frontat the lower edge thereof, see Figure 6, are two lugs having recesses 71 in their rear edges to receive and position the front feet 11 of the machine, and to permit the machine to be brought forward in the casing, so that the front plate of the machine may abut the front wall of the casing.

A base-piece of sound-proof material Tl is secured to the beaded lower rim 15 thereof by screws 7 5 at the front, sides and rear of the casing. The rear wall of the casingbody is preferably provided with a onepiece lining 76; and, as heretofore stated, the end walls 36 of the casing-body are provided with lining-members 48, which are also preferably one-piece members. it has been noted that the side lining-members 48 are mitered where they engage the front lining-members, so that the front and side lining-members hold each other in place where their edges come together. The side lining-members 18 and the rear liningmembers 76 are likewise mitered at their abutting edges for the same purpose. Thus, these lining-members, except at their upper and lower edges,.hold each other in place.

Screws 77, passing through the lining-material from the inside face thereof, are threaded into the beaded rim of the side and, rear walls of the casing to hold the side and rear lining-pieces 4:8 and 76 at their lower edges. A metal strip 7 9 extends along the top edge of the rear lining-member 76 on the inner face thereof; and screws 80, passing through the strip 79 and through the lining-member 76, thread into the metal of the casing to rold the rear lining-member 76 at its upper edge. Similar strips of metal 81 and screws 82 hold the top edges of the side or end lining-pieces to the casingbody.

The casing-cover, at its rear, and for a distance over the top thereof, has a soundproof lining-member 88 which is held in place at its lower edge by screws 89 which pass therethrough and which thread into the wall of the cover. The cover-portion, at the rear thereof, and where it reaches over the type-writer-carriage, is also provided with a smooth interior facing-piece 90, so that the paper on the typewriter-carriage may not be caught and twisted or crumpled by contact with the felt. The screws 89, which serve to hold the lining-member 88, at the lower edge thereof, also serve to hold. the lower edge of the facing-piece 90. The

facing-piece 90 extends slightly below the top edge of the body-portion to prevent the paper from being caught between the body and cover.

A large rectangular opening 91 in the forward upper wall of the cover serves as a window through which the writing may be observed. As shown in the drawings, the cover around the periphery of this opening is re-enforced by a depending rib 92, cast integrally therewith. This rib serves as the frame for a transparent pane 98, which may be of heavy glass. A flange 86, which defines the opening 91 and which, as an integral part of the covereasting, forms a shoulder with the rib 92, serves as a seat for the pane 98. A strip 95 of suitable shock-absorbing material, such as leather, lies between the pane 98 and its seat 80. Two strips of metal 96, one at either end of the window, see Figure 7, are screwed as at 97 to the rib 92 inside of the cover; and, when in place, overlap the end edges of the pane to hold the latter in place. The shoclcabsorbing material 95 is shown as brought around the ends of the pane, as at 98, between the pane and the holding strips 96. The cover-liningpicce abuts the rib 92 at the rear of the window. The facing-piece 90 is screwed at its forward edge at 98 to the rib 92, and thus holds the lining 88 where the latter buts the rear of the window-frame.

The ends or sides of the cover are provided with sound-deadening linings 88-, which may be continuous with the liningmember 88, except where cut away for shaping purposes. The lower edges of the cover side lining-pieces 88 are held in place by metal strips 99, which extend therealong from near the front of the casing-cover to the rear thereof, and which lie against the liningpieces 88 on the inside face thereof. Other strips 99 parallel to the strips 99, are riveted to the inner faces of the cover side members. Screws 100 pass through strips 99, through the lining-pieces 88 and thread into the strips 99 thus holding the edges of the lining-pieces 88. To render sound-proof the casing-cover at the portions 101 thereof at the sides of the window, the side lining-pieces 88 are provided with ears or flaps 102, which are turned over from the upper parts of the pieces 88 to follow the line of the cover to the rib 92 at the sides of the window. The edges of these ears or flaps 102, where they abut the rib 92, are held in place by the strips 96 which hold the window-pane.

At its front forward edge, the cover-casting is off-set downwardly at 108 and terminates in a bead or enlargement 104 which extends horizontally the full width of the cover, along the front of the casing. This bead 104 serves as a re-enforcement for the cover, and also serves as part of the seat for the upper, of two cushions. These cushions-are shown as tubes 109 of rubber or other yieldable, flexible material, each supported in the fold of a strip 110 of flexible material, such as felt, the ends 111 of the strips 110 being brought together between the front or downward offset 103 of the cover and'a metal strip 11 The inner face of the bead 10 1 is shaped as at 105 to the curve of the cushion, and the strip 112 is curved rearward as at 113, also to conform to the curve of the cushion. A metal strip 111 lies against, and runs lengthwise of, the flat part of the strip 112. Screws 115 passing through the metal strips 112 and 114, and the ends of the felt cushion-strips 110, thread into the beaded offset 103 of the cover and hold the upper cushion in place. The upper and lower cushions 109 are normally in contact to prevent escape of sound except where various operating levers and arms project between the cushions from the inside to the outside of the casing; the cushions being resilient to permit of actuation, and movement with the carriage, of these various levers and operating arms;

The lowercushion 109 is supported fin substantially the same manner as the upper cushion. A re-enforcing bead or enlargement 116 inthe casting of the casing-body extends horizontally lengthwise of theupper edge of the front wall 43 of the casing-body. its upper rear edge is shaped as at 117 to the curve of the lower cushion. A metal strip 118 similar to the strip 112 lies against the abutting edges 111 of the cushion felt piece 110, and is bent rearward to conform to the shape of the cushion; a seat thusbeing formed by the bead 116and strip 118. A flat metal strip 83 lies against the rear face of strip 118; and the screws 53, which hold the upper edges of the front liningpieces, pass through the strips 118 and 83 to hold the lower cushion.

At the sides of the casing, the cover, when closed, is supported by the liningunembers; that is to say, the lower edges of the side or end lining-members 88 of the casingcover rest upon the upper edges of the side or end lining-members 18 of the casing-body. At its front, the cover rests on the lower cushion 109. The weight of the cover efiects a substantially sound-proof joint between the abutting edges of the felt. If desired, the metal of the body may, of course, be shaped to provide rests for the cover; but, where the lining-members are of sufficient thickness, and are properly attached, this is not ordinarily necessary. I

To conceal the abutting side pieces of felt, and to PTOtGCL the joints, and to add to the appearance of the casing, the side walls of the cover, as indicated at 84, overlap the top sidees of the casing-body when the cover is closed; and these overlapping. cover-parts 81 are turned slightly outward, so as not to have contact with the casingbody. In order that the ends of the cushions 109 may be covered, the side walls of the :cover are extended forward of the cushions, and have ears turned laterally to overlie the cushions at the front of the latter for a slight distance. The rib 116at the top front-edge of the casing-body is discontinued where the ears 85 are to overlap the front of the casing-body, so as not to interfere with the ears in the closing of the easin'g.

The'cover is held open, and is assisted in The rods 119 slide i so its opening movement, see Figure '5, by two side plates of thecas'ing-body and project 7 through cuts in the end lin'ing-me'mbers 48 of the casing-body. Within the cylinders 123, the rods 119 are provided with collars or pistons 127*, against each of which bears the end of a coiled spring 127'; the other end of which spring has bearing upon the lower forward end of the cylinder. WVhen the cover is closed, the spring is compressed. As the cover is lifted, the pressure of the spring on the pistons 127 tends to throw the cover upward and backward; and, therefore, to assist in the opening thereof. As a buffer, and to prevent strains and shocks on the parts by'too violent an opening of the cover, there is also, within each of the cylinders 123, a spring 128. The springs 128 lie between the pistons 127 and caps 129 on the upper rear ends of the cylinders. As shown in Figure 5, the caps 129 are shouldered to rest against the ends of the cylinders and have annular flanges 130 which fit within the cylinders. Set-screws 130 hold the caps in place on the cylinders. The annular flanges on the caps are of such size as to provide a chamber between the same and the plunger-s or rods 119, for the springs 128; and the pistons 127 are also prefer ably cup-shaped to receive the springs 128. As contradistinguished from the springs 127, the springs 128 are not under compression when the cover is closed. As the rods or plungers 119 move backward with the pistons 127 in the opening of the cover, however, the springs 128 are compressed, and thus act as bulf'ers. The cover may be opened and closed by means of a handle 50, screwed to the front piece thereof.

In the Underwood standard typewriting machines and in other typewriting machines,

the line-space-pawl and operating lever therefor are returned to normal position after each line-space movement by a spring, ordinarily. suitable for such purpose. there, however, the line-space-lever, as in the present invention, is to project through the casing, and is to be moved between cushions 109, which resiliently bear thereon, it may be desirable to provide other than the means heretofore used, for returning the line-space-lever after actuation thereof. In other words, it may be desirable to provide extra power, for the return-throw of the linespace-lever, to overcome the friction enerted on that lever by the opposed resilient cushions 109. Accordingly, in the present invention, see Figure 4, there is provided an auxiliary spring 133 to assist the spring (not shown) which is ordinarily used to return the line-space-lever. In the Underwood machine, the line-space-lever 23 is, in effect, a bell-crank-lever, pivoted at 134 to the carriage-frame, one arm 135 of which bears upon the end of a slide 136 which carries the linespace-pawl. The spring 133 is shown as secured at one end to this slideoperating arm 135 and at its other end to a lug 138 on the front rail 139 of the carriageframe. A lug 140 on the same rail of the carriage-frame limits the return-throw of the line-space-lever; and a plate 141 may be secured to the lugs 138 and 140, as by means of screws 142, to overlie the line-spacelever.

In the Underwood standard typewriting machine, the carriage is controlled by a pinion 144 which meshes with a rack 145 on the carriage. The rack 145 is movable into and out of engagement with the pinion 144 and lifted out of engagement with the pinion 144 when the carriage is to be released. A lever 146, pivoted 147, controls the rack 145, so that, when the forward arm 148 of the lever 146 is depressed, the carriage is released. Ordinarily, the arm 148 carries a finger-piece 149 for actuating the lever 146. It will be noted, see Figure 3, that the forward arm 148 of the carriage-release-lever has a downward-and-forward movement. It will also be noted that in the drawings the linger-piece 149 is shown quite within the casing.

.111 orde that the carriage-release-lever 146 may be operated from without the casing, there is provided, in the present invention, see Figures 2, 3 and 4, another lever 150 which may itself be termed the carriagerelease-lever, and which may be pivoted, as at 151, indirectly to the front carriage-rail 139. The forward arm 152 of the lever 150 is bent downward and is then extended forwardly between the cushions 109; and, its omer end, carries the finger-piece 25. The lever 150 has a lateral swing on its pivot 151. The inner arm 15-1 of the lever 159 is forked, as at 155, to embrace the ver tically-disposed stem or fingerpiece-portion 156 of the lever 14 The pivot 151 of the lever 150 is to the left of the lever 146, so that movement of the linger-piece 25 to the left causes the arm 148 of the lever 146 to be thrown down, and the rack 145 to be lifted out of engagement with the pinion 144, thus releasing the carriage. The fork of the lever 150 allows for the loose play necessary to permit the lateral movement of the lever 150 to be translated into the vertical movement of the lever 146.

In the present invention, the ca 'riage-release-lever 159 is not pivoted directly upon the typewriter-carriage, but is pivoted on an arm 157, which carries the finger-piece 24, for returning the carriage. The carriagereturn-arm 157 is itself secured to the front carriage-rail 139; and, like the carriage-release-lever 150, is bent downward and then.

carried outward between the cushions 109. The fingerpieces 24 and 25 on the carriage return-arm and the carriage-release-lever are adjacent one another, so that the carriage-'returnarm may be engaged by the thumb, and the release-lever by't-he forefinger, to pinch the release-lever toward the carriage-return-arm5 thus enabling the operator to release the carriage with his forefinger, and to control the return-movement of the carriage, while the same is thus held released, by the engagement of his thumb with the carriage-return-arm. By simply removing the screw 151, the auxiliary carriage-release-lever 150 may be detached; after which the carriage-release may be effected in the usual way by the linger-piece 149, when the casing is not used. The carriage-return-arm 157 is also of a special design for use with a casing; and it, also, may be removed at will. The plate 169, on which the arm 15? is formed, is held to the rail 139, see Figure 3, by a tongue piece which is held by screws 151 and 1'71 to the plate 169, and which is offset to engage the bottom of the rail Set-screws 172 also assist in holding plate 169 to the rail 139. By removing the screws 151 and 171, the plate 169, arm 15'? and lever 150 may all be removed.

Secured to the rear and side walls of the casing-body, see Figures 1 and 6, are two brackets 160, in the form of sheet-metal strips passing through cuts in the liningmembers 76 and 48. These strips are set vertically, and each has a pocket 161 therein to receive one of the rear feet 11 of the typewriting machine. The typewriting ma chine is placed in the casing in the manner indicated in Figure 5, that is to say, it is tipped, so that the front extension 12 thereof may be passed through the opening 38 in the front wall of the casing-body, and is thereafter swung downwardly, the

extension 12 being simultaneously swung forwardly until the rear feet 11 of the typewriter enter the pockets 161 in the brackets 160, and the front feet 11 the recesses 71 in the lugs 70. The pockets 161 are so positioned as to cause the front plate of the machine to abut the inner face of the casing front plate. In being this placed in the casing, the side plates 163 of the machine are dropped into the slots 163 in that portion 44 of the front wall of the casing which underlies the opening 38. The weight of the machine, when the casing is on a stand, is carried by the front andrear feet 11. If, when the machine is in place in the casing, the casing be lifted, the flexibility of the felt base-piece 74 allows the machine slightly to settle in its casing until the shoulders 165 at the rear feet of the machine come to rest upon the top edge of the brackets 160,

hang 167 at the left-hand side of the casing:

body, see Figure 1, is greater than the offset or overhang 168 at the right-hand side of the casing-body. This excess of overhang or space at the left-hand side of the casing body is to allow for the throw of a clutch such as is used in the Underwood typewriting machine to release the platen from the line-space mechanism. This clutch, otherwise known as the fractional line-spaceclutch, in the Underwood typewriting ma-' chine is concentric with the axis of the platen, and is shiftable longitudinally outward to the left in the releasing operation.

It will be noted that the marginal stopdevices 175 are so located with respect to the upper front edge of the casing-body as to be conveniently operable when the cover is lifted. It will also be noted that the opening 38 in the casing front is such that the bichrome-shift-lever 176 and the marginrelease-key 177 project therethrough, so as to be operable without lifting the cover.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others,

Having thus described my invention, I claim:

1. In combination, a typewriting machine and a sound-deadening casing therefor; the casing comprising front, rear and side walls in a single casting; a movable cover; the front Wall having an opening therein with a continuous periphery of such size and contour that, upon insertion of the machine,

in forward and downward tilted position, through the top of the casing when the cover is open, the keyboard extension -there-' of may be swung outward through said opening; and sound-deadening linings for the walls and cover; and the ma chine having over the keyboard thereof a sound-deadening front plate, said front plate having an opening in its top portion to expose the types, and a plate insertible in position to close said top opening to complete the closing of the casing, said insertible plate having means to catch upon the typewriting machine to retain itself in position thereon, and the type-writing machine being so positioned in the easing that the front plate of the typewriting machine lies against the inner face of the front wall of the casing.

2. A sound-deadening casing for a type writing machine, comprising, in a single casting, a top having re-enforcing ribs forming a window-frame; a sound-deadening lining for the top; and attached flanges extending from the tops of said ribs to hold in position the edges of said lining and to engage the edges of a transparent pane insaid window-frame.

3. A sound-deadeni1ig casing comprising, in a single casting, a cover, and a re-enforcing rib extending horizontally and longitudinally of the front edge thereof; and a cushion secured to and extending lengthwise of therib; the cushion defining; the upper edge of a slot along which, when. the machine is in the' casing, the operating arms on the machine carriage move as the carriage moves on the machine.

4. A sound-deadening casing comprising, in a single casting, a body-portion, and a reenforcing rib extending horizon-tally and longitudinally of the front upper edge thereof; and a cushion secured to and extending lengthwise of the rib; the cushion defining the lower edge of a slot along which, when the-machine is in the casing, the operating arms on the machine carriage move as the carriage moves on the machine.

5. A sound-deadening casing for, a typewriting machine, comprising a top and an offset window-frame therein, in a single casting; a transparent pane in said frame; a sounddeadening lining having strips extending along the sides of said windowframe; and strips secured to and running along the sides of said frame for holding in place the pane and said strips of the lining. i

6. A sound-deadening casing for a typewriting machine, comprising a top and reenforcing ribs therefor in a single casting; said ribs being shaped to serve as a windowframe; a transparent pane in said frame; asound-deadening lining having strips extending along the sides of said windowframe; and strips secured to and running lengthwise of said ribs at the sides of the frame for holding in place the pane and said strips of the lining.

7. A sound-deadening casing for a typewriting machine, comprising a body-part; a cover; and lining-pieces of felt or other sound-deadening material for the sides of the body and cover; the lining-pieces on the cover abutting the lining-pieces on the casing body to support the cover when the casing is closed; and the side walls of the cover and body then overlapping to conceal such abutting edges of the lining-pieces.

8. A sound-deadening casing for a type writing machine, comprising a body-part; a cover; liningpieces of felt or other sound deadening material for the sides of the body and cover; the lining-pieces on the cover abutting the lining-pieces on the casing body to support the cover when the casing is closed; and the side walls of the cover and body then overlapping to conceal such abut ting edges of the lining-pieces; and abutting cushions on the opposing front edges of the cover and body, which cushions assist in supporting the cover, and provide av yielding slot along which the operating arms on the carriage of themachine may move,

9. A sound-deadening casing for a typewriting machine, comprising a body-part; a cover; lining-pieces of felt or other sound deadening material for the sides of the body and cover; the lining-pieces on the cover abutting the lining-pieces on the casing body to support the cover When the casing is closed; and the side walls of the cover and body then overlapping to conceal such abutting edges of the lining-pieces; and abutting cushions on the opposing front edges of the cover and body, which cushions assist in supporting the cover, and provide a yielding slot along which the operating arms on the carriage of the machine may move; the side walls of the casing cover being offset toward each other at the front to enclose the ends of the cushions.

10. In combination, a typewriting ma chine, a casing therefor, the machine having a front wall with an arcuate opening to expose the types, the casing having a front wall with an opening to give access to the types, a removable plate which may be inserted between the front walls when the casing is in position around said machine, said plate being slidable down behind the front wall of the casing and in front of the front wall of the machine, the edge of said plate overlapping the edge of the arcuate opening in the front wall of the machine, and fingers on said removable plate to engage the front wall of the machine to locate said plate in its effective or closing position.

11. In combination, a typewriting mato close the arcuate opening in said front plate, and fingers on said detachable plate to locate the latter in position on the machine, said fingers engaging said front plate.

1.2. In combination, a typewriting machine, a casing therefor, the machine having a front wall with an arcuate opening to expose the types, the casing having a front wal with an opening to give access to the types, a detachable plate which may be inserted between the front walls when the casing is in position around said machine, two fingers at the top of said plate to engage the machine to locate said plate, and a hoolelike extension at the lower part of said plate to prevent movement of said plate away from said machine.

'23. it sound-deadening casing for a type- .rriting machine, comprising a body-part, a cover having a cast front wall flared outtrdly at its lower edge and provided with a channel of arcuate cross-section in the rear face of the flared edge, and a tubular cushion to rest in said channel.

i l. The combination with a typewriting machine, of a sound-subduing cabinet within which the typewriting machine is fitted and by which it is supportable, said cabinet comprising a lower body-portion, and an upper cover-portion hinged thereto in rear, a slot intervening between the front of the cover and the top of the body, through which slot extend controlling devices from the carriage, said slot sealed in a manner to permit free travel of the carriage, said body-portion having a rear wall, a front wall, and overhanging side walls, all formed of a single rigid, unjointed, die-cast shell, making a continuous frame open at top and bottom, an opening being provided in said front wall between the top and bottom, through which the keyboard of the typewriter protrudes, said front wall unbroken at its top and also unbroken at its bottom, the typewriting machine being insertable downwardly and forwardly into the body in a manner to thrust the keyboarc portion forwardly through said opening in the front wall, as set forth.

15. The combination with a typewriting machine, of a sound-subduing cabinet within which the typewriting machine is fitted and by which it is supportable, said cabinet comprising a lower body-portion, and an Cir lit)

upper cover-portion hinged thereto in rear, a slot intervening between the front of the cover and the top of the body, through which slot extend controlling devices from the carriage, said slot sealed in a manner to permit free travel of the carriage, said bodyportion having a rear wall, a front wall, and overhanging side walls, all formed of a single rigid, unjointed die-cast shell making a continuous frame open at top and bottom, an opening being provided in said front wall between the top and bottom, through which the keyboard of the typewriter protrudes, said front wall unbroken at its top and also unbroken at its bottom, the typewifliting machine being insertible downwardly and forwardly into the body in a manner to thrust the keyboard portion forwardly through said opening in the front wall, as set forth, said shell having integral means for locating the typewriting machine, and provision being made for lifting or supporting the encased typewriting machine by the casing.

16. The combination with a typewriting machine, of a sound-subduing cabinet within which the typewriting machine is fitted, and by which it is supportable, said cabinet comprising a lower body-portion, and an upper cover-portion hinged thereto n rear, a slot intervening between the front of the cover and the top of the body, through which slot extend controlling devices from the carriage, said slot sealed in a manner to permit free travel of the carriage, said body-portion having a rear wall, a front Wall, and overhanging side walls, all formed of a single rigid, unjointed die-cast shell making a continuous frame open at top and bottom, an opening being provided in said front wall between the top and bottom, through which the keyboard of the type writer protrudes, said front wall unbroken at its top and also unbroken at its bottom, the typewriting machine being insertible downwardly and forwardly into the. body in a manner to thrust the keyboard portion forwardly through said opening in the front wall,- as set forth, said shell having stiffening ribs, and sound-proof linings confined in place by said ribs.

17. The combination with a typewriting machine, of a sound-subduing cabinet within which the typewriting machine is fitted,

and by which it is supportable, said cabinet comprising a lower body-portion, and an upper cover-portion hinged thereto in rear, a slot intervening between the front of the cover and the top of the body, through which slot extend controlling devices from the carriage, said slot sealed in a manner to permit free travel of the carriage, said body-portion having a rear wall, a front wall, and overhanging side walls, all formed of a single rigid unjointed die-cast shell makingva continuous frame open at top and bottom, an opening being provided in said front wall between the top and bottom, through which the keyboard of the typewriter protrudes, said front wall unbroken at its top and also unbroken at its bottom, the typewriting machine being insertible downwardly and forwardly into the body in a manner to thrust the keyboard portion forwardly through said opening in the front wall, as set forth, the front open wall of said shell having at its top edge an integral stiffening rib, which rib also defines the lower edge of the slot for the traveling carriage handle.

18. The combination with a typewriting machine, of a sound-subduing cabinet within which the typewriting machine is fitted, and by which it is supportable, said cabinet comprising a lower body-portion, and an upper cover-portion hinged thereto in rear, a slot intervening between the front of the cover and the top of the body, through which slot extend controlling devices from the carriage, said slot sealed in a manner to permit free travel of the carriage, said body-portion having a rear wall, a front wall, and overhanging side walls, all formed of a single rigid, unjointed diecast shell making a continuous frame open at top and bottom, an opening being provided in said front wall between the top and bottom, through which the keyboard of the typewriter protrudes, said front wall unbroken at its top and also unbroken at its bottom, the typew'riting machine being insertible downwardly and forwardly into the body in a manner to thrust the keyboard portion forwardly through said opening in the front wall, as set forth, the front open wall of said shell having at its top edge an integral stiffeningrib, which rib also defines the lower edge of the slot for the traveling carriage handle, said slot being closed by a locally yielding tubular cushion, and said rib being shaped to serve as a depression, or seat for said cushion.

19, The combination with a typewriting machine, of a sound-subduing cabinet within which the typewriting machine is fitted, and by which it is supportable, said cabinet comprising a lower body-portion, and an upper cover-portion hinged thereto in rear, a slot intervening between the front of the cover and the top of the body, through which slot extend controlling devices from the carriage, said slot sealed in a manner to permit free travel of the carriage, said body-portion having a rear wall,

a front wall, and overhanging side walls, 1

all formed of a single rigid, unjointed diecast shell making a continuous frame open at top and bottom, an opening being provided in said front wall between the top and bottom, through which the keyboard of the.

ltlii typewriter protrudes, said front wall un-j broken at its top and also unbroken at its bottom, the typewriting machine being insertible downwardly and forwardly into the body in a manner to thrust the keyboard portion forwardly through said opening in the front wall, as set forth, the front open wall of said shell having at its top edge an integral stiffening rib, which rib also defines the lower edge of the slot for the 10 traveling carriage handle, said slot being closed by a locally yielding tubular cushion, and said rib being shaped to serve as a depression or seat for said cushion, and detachable means secured to said rib to cooperate therewith to embrace the cushion in part and hold it in place.

GEORGE W. CAMPBELL. 

